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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HSEARCH" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-1468" style="color: #3b73af; text-decoration: none"><img src="https://hibernate.atlassian.net/images/icons/issuetypes/improvement.png" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-1468" style="color: #3b73af; text-decoration: none">HSEARCH-1468</a>
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Affects Versions:
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4.4.2.Final
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Unassigned
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engine
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Created:
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17/Dec/13 10:13 AM
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core faceting
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Priority:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="abrin" id="email_abrin" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=abrin" style="color:#6c797f;; color: #3b73af; text-decoration: none">adam</a>
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We've recently been profiling our application using YourKit and noticed that a tremendous number of objects are being created and subsequently destroyed by the FacetCollector because it's collecting Integer objects in its map. At this point, the faceting component of HibernateSearch appears to take the most time of anything else in the entire action.</p>
<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">While the JVM is clearly better in the management of these temporary objects, the trivial nature of this operation over-time may likely add up to something non-trivial when counting. An alternate approach might be to use a wrapper class for an integer that only gets instantiated once:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> class IntegerWrapper {
<span class="code-object" style="color: #910091">int</span> count = 0;
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">int</span> getCount() {
<span class="code-keyword" style="color: #000091">return</span> count;
}
<span class="code-keyword" style="color: #000091">public</span> void setCount(<span class="code-object" style="color: #910091">int</span> count) {
<span class="code-keyword" style="color: #000091">this</span>.count = count;
}
<span class="code-keyword" style="color: #000091">public</span> void incrementCount() {
<span class="code-keyword" style="color: #000091">this</span>.count++;
}
}
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<p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">useful references:</p>
<ul>
<li>
<a href="http://stackoverflow.com/questions/9731142/in-java-how-to-improve-performance-of-object-creation" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://stackoverflow.com/questions/9731142/in-java-how-to-improve-performance-of-object-creation</a>
</li>
<li>
<a href="http://drmirror.net/2013/06/06/object-creation/" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://drmirror.net/2013/06/06/object-creation/</a>
</li>
</ul>
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